FlexBond® Premium Crack Prevention Thin-set Mortar

Product ID: TDS-115

A premium, polymer-modified mortar with exceptional flexbility and bond strength. Ideal for hard-to-bond surfaces such as nonporous tile.

  • High flexibility prevents cracks in tile
  • For difficult to bond subtrates, such as plywood, vinyl or laminate
  • Outstanding bond to glass and other decorative tile
  • Exceeds A118.15 and A118.11

Coverage Chart


For tile with longest side 15"+, use a medium bed mortar from CUSTOM designed for large format and heavy tile.

Trowel Size Min Coverage Max Coverage
Longest side of tile less than 8" use 1/4" x 1/4" x 1/4" (6 x 6 x 6 mm) Square-Notch 85 sq. ft. (7.9 M²) 95 sq. ft. (8.8 M²)
Longest side of tile 8" to 15" use 1/4" x 3/8" x 1/4" (6 x 9.5 x 6 mm) Square-Notch 60 sq. ft. (5.6 M²) 67 sq. ft. (6.2 M²)

Recommended minimum coverage (80% for dry areas and 95% for wet areas and exteriors). Back buttering may be necessary.

Note that mortar coverage does not include backbuttering tiles. When backbuttering, consider the tile underside pattern and depth to estimate thickness and usage to add to your estimate.

Chart for estimating purposes. Coverage may vary based on installation practices and jobsite conditions. For more sizes, use the material calculator at CustomBuildingProducts.com or contact CUSTOM Technical Services at 800-282-8786.

Related Product(s)

Materials Calculator Determine how much material you need for your project.